Giant $g$-factors of Natural Impurities in Synthetic Quartz

  title={Giant \$g\$-factors of Natural Impurities in Synthetic Quartz},
  author={Maxim Goryachev and Warrick G. Farr and Michael E. Tobar},
  journal={Applied Physics Letters},
We report the observation of g-factors of natural paramagnetic impurities in a pure synthetic quartz crystal at milli-Kelvin temperatures. Measurements are made by performing spectroscopy using multiple high-Q whispering gallery modes sustained in the crystal. Extreme sensitivity of the method at low temperatures allows the determination of natural residual impurities introduced during the crystal growth. We observe g-factors that significantly differ from integer multiples of the electron g… 

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